coin return slot; change slot
Refers to the slot on a vending machine, ticket machine, or similar device where coins are returned as change.
Please don't forget to take your change from the vending machine's coin return slot.
I put my hand into the change slot and felt around for leftover coins.
硬貨投入口 is the coin insertion slot, whereas 釣り銭口 is the coin return slot.
Standard kanji spelling using 釣り (fishing/change) and 銭 (coin).
Variant without okurigana; less common but still seen.
Mixed kana-kanji spelling; rarely used.
Compound of 釣り (つり, 'change' from 釣る 'to fish/make change') + 銭 (せん, 'coin') + 口 (ぐち, 'mouth/opening'). The reading せん for 銭 is a relatively common Sino-Japanese reading in compounds.