noun🔗ShareA small nail-like tack with a slightly rounded head that can be pressed into place with light pressure from the thumb; used for hanging light articles on a wall or noticeboard."I used a thumbtack to hang my son's drawing on the refrigerator. "stationeryitemutensilthingChat with AIVocabulary GamePractice Reading
verb🔗ShareTo fix or attach something with a thumbtack."He thumbtacked the important notes to the bulletin board. "stationeryutilityitemChat with AIVocabulary GamePractice Reading