on one's home ground
Where one has the advantage of familiarity. For example, Teams generally find it easier to win on their home ground, or The candidate from Maine was speaking on his home ground.
Words nearby on one's home ground
on one's guard,
on one's hands,
on one's head,
on one's heels,
on one's high horse,
on one's home ground,
on one's honor,
on one's last legs,
on one's mind,
on one's own,
on one's own account