日本語 
（〜で）気を取り直す、元気を出す
英語での表現＆単語の場合は品詞
take heart (from[at] 〜)
※heartを無冠詞・単数形で用いることに注意。
※heartを無冠詞・単数形で用いることに注意。
英語例文＆出典
The number of coronavirus deaths in New York state increased to 799 on Wednesday, a record high for a third day. But Governor Andrew Cuomo took heart from the fact that the number of Covid-19 patients admitted to New York hospitals dropped for a second day, to 200.
https://www.bbc.com/news/world-us-canada-52239261
London survived the plague — take heart from Samuel Pepys
https://www.standard.co.uk/comment/comment/london-...
※"Take heart from 〜." という命令文で「〜という先例があるんだから絶望すんな」くらいの意味か（スピーチレベルは別として）。
Take Heart from Mary's*1 saying: 'We'll hoor it out'
https://www.independent.ie/regionals/kerryman/news...
※"hoor" はアイルランド、ケリー州の方言なので辞書には載ってない。記事によると、「必ず切り抜けられる」という意味。
This was Anne’s shopping list for her and her daughter, the future Queen Elizabeth I, for the weeks between 20 January and 27 April 1536. Reading it, I think we can all now feel much better about the current contents of our online shopping baskets. I also take heart at how seriously she took her gowns and nightgowns – the equivalent of dressing gowns, and those in which a queen might receive visitors.
https://www.vogue.co.uk/fashion/article/anne-boley...
https://www.bbc.com/news/world-us-canada-52239261
London survived the plague — take heart from Samuel Pepys
https://www.standard.co.uk/comment/comment/london-...
※"Take heart from 〜." という命令文で「〜という先例があるんだから絶望すんな」くらいの意味か（スピーチレベルは別として）。
Take Heart from Mary's*1 saying: 'We'll hoor it out'
https://www.independent.ie/regionals/kerryman/news...
※"hoor" はアイルランド、ケリー州の方言なので辞書には載ってない。記事によると、「必ず切り抜けられる」という意味。
This was Anne’s shopping list for her and her daughter, the future Queen Elizabeth I, for the weeks between 20 January and 27 April 1536. Reading it, I think we can all now feel much better about the current contents of our online shopping baskets. I also take heart at how seriously she took her gowns and nightgowns – the equivalent of dressing gowns, and those in which a queen might receive visitors.
https://www.vogue.co.uk/fashion/article/anne-boley...