broadenvi.
英 'brɔːd(ə)n | 美 'brɔdn
中文vi. 扩大，变阔；变宽，加宽\nvt. 使扩大；使变宽
扩大，变阔；变宽，加宽
vt. 使扩大；使变宽
词根词源
broaden (v.)1727, from broad (adj.) + -en (1). The word seems no older than this date (discovered by Johnson in one of James Thomson\\'s "Seasons" poems); broadened also is first found in the same poet, and past participle adjective broadening is recorded from 1850.
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