ἐνέχωenéchō

to hold in or upon, i.e. ensnare; by implication, to keep a grudge

Greek (New Testament) · G1758

Meanings

1. to hold in; passive, to be held, entangled: with dative of thing; figuratively, ζυγῷ δουλείας, Galatians 5:1; θλίψρεσιν, 2 Thessalonians 1:4 (cf. ἀσεβείσιν, 3 Maccabees 6:10).

2. to set oneself against, be urgent against (as Genesis 49:23; for construction, see Swete, Mk., in the passage cited): Mark 6:19, Luke 11:53.

Same root

ἐνen · G1722"in," at, (up-)on, by, etc.
ἔχωéchō · G2192to hold (used in very various applications, literally or figuratively, direct or remote; such as possession; ability, contiuity, relation, or condition)
ἔνοχοςénochos · G1777liable to (a condition, penalty or imputation)

Where it appears

Appears 3 times in the Bible.

Mark 6:19 So Herodias bore a grudge against John and wanted to kill him. But without Herod’s approval she was powerless,
Luke 11:53 As Jesus was leaving, the teachers of religious law and the Pharisees became hostile and tried to provoke him with many questions.
Galatians 5:1 So Christ has truly set us free. Now make sure that you stay free, and don’t get tied up again in slavery to the law.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.