conlangs1-9  Exercise 3: A Touch of Naturalism
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One possible answer.

Add the verb "go": the regular past would be *ruasa*, but make it irregular:

  rua "go" -> past: *ran* (not *ruasa*)

Why a long-lived language might have this: very frequent words are used so
often that they wear down over time and lose their regular shape. English
"go / went" and Spanish "ir / fue" are examples. A frequent word in Meren
could do the same, and an irregular "go" would make the language feel old.

The relex test on a Meren sentence:

  Mi lion teka.     I fish-OBJ eat.
  Word for word:    "I fish eat."

This is not English word order, so the grammar is doing its own work: the
verb is last and the object has its own suffix. Compare with a relex: "Mi
teka lio" would just be "I eat fish" with new words in the same order.

Your own answer will differ. Check that your irregular form is a common
word, and that your relex test points to a real difference in grammar and not
only in vocabulary.