To pass on the windward side of any obstacle, object or craft. As far as I know there is no verb for passing to leeward of an object. One covers such events by a negative statement, as ‘She won’t be able to weather it’, or ‘We failed to weather the buoy, and a few minutes later we were on the putty’. Such statements imply an unaccomplished desire to weather the mark. Where the intention was to pass to leeward one might say ‘We left the buoy to weather’, or, ‘We passed to leeward of the buoy’.