All are fine with the same meaning, but "warm-up/heat-up" is most common.
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VorparAll are fine with the same meaning, but "warm-up/heat-up" is most common.Thanks, Vorpor.
Mister MicawberI would consider warm up the verb and warm-up the noun and adjective. Does your dictionary really show a hyphenated verb, Vorpar?Tunnel-visioned that one. You're right, hyphenated is only for the noun.