"decreasing" in the verb sense
1. decrease, diminish, lessen, fall
decrease in size, extent, or range
"The amount of homework decreased towards the end of the semester"
"The cabin pressure fell dramatically"
"her weight fell to under a hundred pounds"
"his voice fell to a whisper"
2. decrease, lessen, minify
"He decreased his staff"
"decreasing" in the adjective sense
becoming less or smaller
music) decreasing in tempo and/or volume
Source: WordNet® (An amazing lexical database of English)
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