(draw) a line in the sand
US /drɔ ə laɪn ɪn ðə sænd/
UK /drɔ ə laɪn ɪn ðə sænd/
1.
to establish a limit beyond which one will not go; to set a boundary or a point of no return
:
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The company decided to draw a line in the sand regarding employee benefits, stating no further concessions would be made.
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I told him he could borrow my car, but I drew a line in the sand at him taking it out of state.