buck up (someone)

to encourage someone to be energetic and positive.

I told the kids when they had colds to buck up and tough it out.

• make good on
• make good on something
• make good someone's something
• make great play of
• make great play of something
• make hair stand on end
• make hard work of
• make hard work of doing something
• make hard work of something
• make hay
• make hay while the sun shines
• make headlines
• make heads or tails of
• make heads or tails of something
• make heads or tails out of
• make heads or tails out of something
• make headway
• make heavy weather of
• make heavy weather of doing something
• make heavy weather of something
• make history
• make it big
• make it business to
• make it business to do something
• make it good