[Ask ] These two idioms' definition

[hbljc (賈斯汀玉米)]

 Hello every! I would like to know the definitions of these two idioms.

 I have checked the idiom websites, but I still couldn't find the answers.

 These are the two idioms:

 1. to keep pitching

 2. in there pitching

 I would appreciate it if you shared the answers to me or us.

 Thanks.

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