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Phrase(s): brace oneself for something
1. Lit. to hang onto something or prop oneself against something in preparation for something that might cause one to fall, blow away, wash away, etc. • Hold onto the rail. Brace yourself. Here comes another huge wave. 2. Fig. to prepare for the shock or force of something. • Brace yourself for a shock. • As the boat leaned to the right, I braced myself for whatever might happen next.
McGrawhill's American Idioms And Phrasal Verbs