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Wiktionary
choke up

vb. 1 (context intransitive English) To (temporarily) lose one's power of speech, because of embarrassment, fear etc. 2 (context transitive English) To block up, to cause something to be blocked.(rfex) 3 (context transitive English) To block, to block up (qualifier: figuratively).(rfex) 4 (context baseball intransitive English) To hold the bat higher (farther from the knob) than is normal.

WordNet
choke up

v. obstruct; "My nose is all stuffed"; "Her arteries are blocked" [syn: stuff, lug, block] [ant: unstuff]