We have no meanings for "undo a button" in our records yet.
1 The effort of getting to the river had exhausted him so much he could barely undo a button .
2 They get Mary to undo a button and then Sogand lingers uncomfortably close to Matt's face for a really long time.
3 Any attempt by a private to undo a button , or take off his helmet, would immediately be halted, and the miscreant's name taken for punishment.
4 ' Undo a button or two and he's your slave for life.
5 With throbbing pulse, Hope felt the small revolver hidden within her dress, undoing a button so that, in emergency, she might grasp it more quickly.
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