This root form (lemma) is used in 2 different forms in the NT: ἐπεχείρησαν (IAA3··P), ἐπεχείρουν (IIA3··P).
It is glossed in 2 different ways: ‘were attempting’, ‘attempted’.
OET LUKE 1:1 Greek word=ἐπεχείρησαν (epeⱪeiraʸsan) Morphology=IAA3··P English gloss=‘attempted’ SR GNT LUKE 1:1 word 3
OET ACTS 9:29 Greek word=ἐπεχείρουν (epeⱪeiroun) Morphology=IIA3··P English gloss=‘were attempting’ SR GNT ACTS 9:29 word 12
OET ACTS 19:13 Greek word=ἐπεχείρησαν (epeⱪeiraʸsan) Morphology=IAA3··P English gloss=‘attempted’ SR GNT ACTS 19:13 word 1