מַטָּרָא maṭṭârâʼ (H4307)

a jail (as a guard-house); also an aim (as being closely watched)

1) guard, ward, prison, mark, target 1a) guard, ward, prison 1b) target, mark (fig. of chastisement)

or מַטָּרָה; from נָטַר (H5201);