noun:

• wearing next to the skin (e.g. shoes without socks, trousers without underwear)

noun:

• the art of giving a brief glimpse of something (e.g. one's underwear)

noun:

• trunks (swimming, boxing, etc.)
• trunks (underwear); boxers; boxer shorts

godan ~む verb / intransitive verb:

• to bite into (e.g. rope into skin); to cut into; to dig into (e.g. of fingernails)
• to eat into; to encroach; to make inroads; to penetrate (e.g. a market); to break into (e.g. first place); to erode; to cut into (e.g. time, savings)
• to be wedged (i.e. underwear pulled from the back, driving it between the buttocks) - vulgar

noun:

• naked tribe; tribe or group that habitually goes naked
• nudist; nudism ➜ ヌーディズム
• being habitually undressed at home or in hotel rooms etc. (e.g. dressed in underwear) - slang

noun / counter:

• swing; shake; wave; swinging

noun:

• appearance; behaviour - usually written using kana alone
• pretence (pretense); show; pretending (to) - oft. after a noun+の or verb in the dictionary form - usually written using kana alone ➜ 振りをする

noun / ~の noun:

• going to restaurant, hotel etc. without a reservation or introduction - usually written using kana alone

noun:

• move (dance); postures
• lead in (e.g. to a running joke, asking a question); lead up - oft. as フリ - usually written using kana alone ➜ 前振り
• unsewn part of a hanging sleeve on a traditional Japanese woman's garment

suffix / counter:

• counter for swords, blades, etc.

noun:

• not wearing underwear or pants - archaism