Hack off and Niggle

Hack off verb - To disturb the peace of mind of (someone) especially by repeated disagreeable acts.

Niggle and hack off are semantically related In some cases you can use "Niggle" instead a verb "Hack off".

Niggle verb - To make often peevish criticisms or objections about matters that are minor, unimportant, or irrelevant.

Hack off and niggle are semantically related in rile topic. Sometimes you can use "Hack off" instead a verb "Niggle". informal substitute