backingn.
英 'bækɪŋ | 美 'bækɪŋ
中文n. 支持；后退；支持者；衬背\nv. 支持（back的ing形式）
支持；后退；支持者；衬背
v. 支持（back的ing形式）
词根词源
backing (n.)1590s, "support;" 1640s, "retreat;" verbal noun from back (v.). Physical sense of "anything forming a backing to something else" is from 1793. Meaning "musical accompaniment" is recorded from 1940.
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