untier

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a person who unfastens or unwraps or opens
- children are talented undoers of their shoelaces
• Syn:
undoer, opener, unfastener
• Derivationally related forms:
untie, unfasten (for: unfastener), open (for: opener), undo (for: undoer)
• Hypernyms:
person, individual, someone, somebody, mortal, soul