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Comprehensive
Dictionary Suite
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fall behind to not keep up with; lag behind.
keep in touch to remain in contact; keep up communication (often fol. by "with").
lag to fall behind; fail to keep up with. [1/6 definitions]
Rip Van Winkle a person who fails to keep up with the times, esp. regarding popular tastes. [1/2 definitions]
sustain to keep up the spirits of; encourage. [1/8 definitions]