Definitions for "Weather helm"
a vessel is said to bear a weather helm when it tends to come up to the wind, a tendency that must be counteracted with the helm [191.31
the tendency for a boat to steer itself into the wind
A ship has weather helm when she tends to come up into the wind and thus requires the rudder to be turned a certain amount to correct this tendency. In boats with a helm as opposed to a wheel, it meant keeping the helm slightly to windward of the centre line.