morale booster

Wooed by Donald Trump, Taiwan Trembles A2 The phone conversation with President Tsai was a morale booster, but many Taiwanese now fear the island, and not the U.S., will bear the brunt of Beijing’s ire.

booster 

Pronunciation: /ˈbuːstə/ 

NOUN

1A device for increasing electrical voltage or signal strength.

Example sentences

2The first stage of a rocket or spacecraft, used to give initial acceleration and then jettisoned. 1944

Example sentences

3Medicine A dose of a vaccine that increases or renews the effect of an earlier one:boosters at five-year intervals are recommended[AS MODIFIER]: a booster injection

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4[IN COMBINATION] A source of help or encouragement:job fairs are a great morale booster

4.1North American A keen promoter of a person, organization, or cause.

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5North American informal A shoplifter.