"tucking" in the verb sense
1. tuck, insert
fit snugly into
"insert your ticket into the slot"
"tuck your shirttail in"
2. tuck
make a tuck or several folds in
"tuck the fabric"
"tuck in the sheet"
3. gather, pucker, tuck
draw together into folds or puckers
Source: WordNet® (An amazing lexical database of English)
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