pre-noun adjectival
pierced; drilled; perforated; hollow
Pre-noun adjectival describing something that has a hole or holes, either naturally or made by drilling/piercing. Often used for items like coins, tickets, or materials.
See also: 穴明き銭 (あなあきせん)
穴あきの硬貨は使えないことがある。
Pierced coins may not be usable.
穴あきのチケットを回収した。
We collected the punched tickets.
Compound of 穴 (あな, 'hole') and あき, the noun form of 開く (あく, 'to open'). Literally 'hole-opening', referring to something that has a hole.