Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: clog 'to prevent an animal from moving by tying a wooden block to it' (14-19 centuries), from clog (noun); CLOG2

clog

1 verb
     
clog1 also clog up past tense and past participle clogged, present participle clogging [intransitive and transitive]
to block something or become blocked:
tourists whose cars clog the roads each summer
clog with
Over many years, the pipes had got clogged up with grease.
clogged adjective:
clogged highways

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