heating-up ( synonym found)
Definition of heating-up:

(n) : a system that raises the temperature of a room or building. Confer heater
(adj) : causing heat
(v) : present participle of "to heat."
Definition of heating-up:

(n) : a system that raises the temperature of a room or building. Confer heater
(adj) : causing heat
(v) : present participle of "to heat."
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