(Jekyll-and-Hyde words; words that have two distinctly contrary or even opposite meanings)

sanction, sanctions
1. To permit or to officially accept or to allow something; "The government will sanction the use of force."
2. A penalty or an action that is taken or an order that is given to force a country to obey international laws by limiting or stopping trade with that country, by not allowing economic aid for that country, etc.; "The United Nations has decided to impose economic sanctions on the country."

An event may be sanctioned by some authority, while a country might suffer sanctions for its actions.

1. To moderate or to soften; "Temper your anger with compassion."
2. To toughen; "The steel is tempered with additives to make it stronger."
1. To hold up; to bear; "The ship weathered the storm."
2. To wear away; "The rocks are weathered away by the tide waters."
wind up
1. To bring to an ending; "Let's wind up this meeting now, please."
2. To start; "Wind up the clock now so it will start keeping time and start the alarm in the morning."