| Term | Definition |
| udoshi (卯年) | the year of the Hare |
| u (鵜) | a cormorant |
| ukai (鵜飼) | cormorant fishing |
| uba (乳母) | a nurse |
| ubaguruma (乳母車) | a baby carriage, a baby buggy, a perambulator, [Infml.] a pram |
| ubau (奪う) | to take away, to rob, to deprive; [人目を] to dazzle; [野球でヒットを] to win |
| ubaiau (奪い合う) | to struggle |
| ubaikaesu (奪い返す) | to take back, to recover |
| kokoro o ubawareru (心を奪われる) | to be fascinated/charmed, to lose one's heart to |
| ubazakura (姥桜) | a faded beauty |
| ubuna (初な) | innocent, naive |
| ubuge (産毛) | downy hair |
| ubugi (産着) | clothes for a (newborn) baby |
| ubugoe o ageru (産声をあげる) | to be born, to see the light (of day) |
| ubuyu o tsukawaseru (産湯をつかわせる) | to give a (newborn) baby a bath |
| uchi (内) | the inside, the interior; in, inside, within, indoors; one's home/house; in, within, during, while, before; of, between, among, out of |
| uchi ni iru (内にいる) | to be in, to be at home |
| uchi ni inai (内にいない) | to be out, to be away from home |
| uchiage (打上げ) | shooting up, sending up, launch, a display [of fireworks]; the close [of a run] |
| uchiagehanabi (打上げ花火) | a skyrocket |
| uchiageru (打ち上げる) | to shoot off, to fire off, to let off, to set off, to send, to launch; [波が物を] to throw up on the shore; [興行を] to finish, to end, to close |
| uchiai (打合い/撃合い) | a fight, an exchange of shots |
| uchiakeru (打ち明ける) | to tell, to confess, to disclose, to confide |
| kyōchū o uchiakeru (胸中を打ち明ける) | to speak one's mind frankly |
| uchiakebanashi (打明け話) | a confidential talk |
| uchiau (打ち合う/撃ち合う) | to fight, to exchange blows, to exchange shots |
| uchiawase (打合せ) | an arrangement, arrangements |
| uchiawase o suru (打合せをする) | to arrange, to make arrangements, to fix |
| uchiawasekai (打合せ会) | a preliminary meeting/conference, a consultation |
| uchiawasekai o hiraku (打合せ会を開く) | to hold a preliminary meeting/conference, to hold a consultation |
| uchibarai toshite (内払いとして) | as part payment, in partial payment, as earnest money |
| uchibari (内張り) | lining, ceiling |
| uchibenkei (内弁慶) | a lion at home and a mouse abroad |
| uchibori (内堀/内濠) | an inner moat |
| uchibu (打歩) | [Com.] a premium, an agio |
| uchidashi (打出し) | [興行の] the close; embossed work |
| uchidasu (打ち出す/撃ち出す) | to open fire; [模様を] to emboss; [政策を] to announce, to publish, to disclose, to hammer out; [原則を] to lay down; to end, to close |
| uchidenokozuchi (打出の小槌) | a mallet of luck, a cornucopia, an Aladdin's lamp |
| uchideshi (内弟子) | a private pupil, an apprentice |
| uchidome ni suru (打ち止めにする) | to bring to a close, to bring to an end |
| uchigawa (内側) | the inside |
| uchigawa no (内側の) | inside, inner |
| uchigeba (内ゲバ) | an intra-group strife, an inter-group strife |
| uchiharau (打ち払う) | to beat off, to shake off; to drive away |
| uchihimo (打紐) | a braid |
| uchihishigarete (打ち拉がれて) | crushed [by one's misfortunes] |
| uchihorobosu (討ち滅ぼす) | to destroy, to wipe out |
| uchiiri (討入り) | a raid, a break-in |
| uchiiwai no okurimono (内祝の贈物) | a little present as a token of a family celebration |
| uchijini suru (討死する) | to die in battle, to be killed in battle, to fall on the battlefield |
| uchijū (家中) | the whole family; all over the house |
| uchikaesu (打ち返す) | to strike back, to beat back, to hit back, to give a counterblow; [波が] to roll [on the shore]; [綿を] to rewhip |
| uchikake (打掛け) | an uchikake, a long outer garment |
| uchikata hajime (撃ち方始め) | Fire! |
| uchikata yame (撃ち方やめ) | Cease fire! |
| uchikatsu (打ち勝つ) | to conquer, to overcome |
| uchikeshi (打消) | a denial, negation |
| uchikeshi no (打消しの) | negative |
| uchikesu (打ち消す) | to deny |
| uchikina (内気な) | shy, bashful, reserved |
| uchikin toshite harau (内金として払う) | to pay on account |