Английский какой-то кривой и смысл не очень понятный
to send (something) off

Я должен был (что-то) отослать в UK для запчасти

чушь какая-то

The English is perfect))) To SEND OFF TO… FOR means that you have to look somewhere else in order to find something - you can’t find it locally.

https://www.google.com/search?q=%22I+have+to+send+off+to%22&client=firefox-b-1-d&sxsrf=ALeKk03aiyEP75kPGDeXpZHIixdQqoLhWg%3A1623416804800&ei=5F_DYNWZMJbp-gSRipa4CA&oq=%22I+have+to+send+off+to%22&gs_lcp=Cgdnd3Mtd2l6EAM6CAghEKABEIsDOgUIIRCrAlCuqQFYhK0BYPWwAWgCcAB4AIABygGIAaYEkgEFMC4yLjGYAQCgAQGqAQdnd3Mtd2l6uAECwAEB&sclient=gws-wiz&ved=0ahUKEwjVm-Pv0o_xAhWWtJ4KHRGFBYcQ4dUDCA0&uact=5

In this case, the speaker is emphasizing how far they have to look to get the replacement.

The sentence is from https://dictionary.cambridge.org/dictionary/english/send-off-away-for-to-sth - an example for "to write to an organization to ask them to send you something"

I see now that it's an idiom, but it still sounds odd to me.

If it didn’t sound odd to you, then by definition, it wouldn’t be an idiom.

by definition

I disagree. Many idioms sound natural and only the meaning differs from the direct one.

Oxford Dictionary: IDIOM. a group of words established by usage as having a meaning NOT DEDUCIBLE from those of the individual words (e.g., rain cats and dogs, see the light ).

However, SEND OFF FOR isn’t an idiom for that very reason. It’s a phrasal verb.

да, согласен

Oh wow, when I translated this in my head, I also used аж 👍🏼

✅