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Phrase(s): drop by the wayside [and] fall by the wayside
1. Lit. to leave a march or procession in exhaustion to recover beside the pathway. • A few of the marchers dropped by the wayside in the intense heat. 2. Fig. to fail to keep up with others. • Many of the students will drop by the wayside and never finish. • Those who fall by the wayside will find it hard to catch up.
McGrawhill's American Idioms And Phrasal Verbs