fall behind, fail to keep up, be outpaced, slow down; see fail 1, lag 1, lose 3.
"drop behind." YourDictionary, n.d. Web. 16 January 2019. <https://thesaurus.yourdictionary.com/drop-behind>.
drop behind. (n.d.). Retrieved January 16th, 2019, from https://thesaurus.yourdictionary.com/drop-behind
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