The main problem is that language X has an implicit definition of Foo, which is similar but not identical to language Y's definition of Bar. This might work whe

The main problem is that language X has an implicit definition of Foo, which is similar but not identical to language Y's definition of Bar. This might work when the languages share common ancestry like German and English, where Foo and Bar are both descendent from Baz and have similar meanings, but will not work when you try to translate to language Z, whose speakers have a different word Foobar which has a meaning that encompasses Baz and Qux but excluding Xyzzy and with a completely different connotation.