Strong's 1907 (ἐπέχω)

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give (take) heed unto, hold forth, mark, stay

to hold upon, i.e. (by implication) to retain; (by extension) to detain; (with implication, of G3563 (νοῦς)) to pay attention to

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from G1909 (ἐπί) and G2192 (ἔχω);