To Choke Up

1. (intransitive) To (temporarily) lose one's power of speech, because of strong emotion.
2. (transitive) To cause (a person) temporarily to lose the power of speech, because of strong emotion.
3. (intransitive, often imperative) To cease talking.
4. (transitive, sometimes figurative) To block up; to cause something to be blocked.
5. (baseball, intransitive) To hold the bat higher (farther from the knob) than is normal.