to  perk (up) one's ears
<abbr style="text-decoration: underline;" title="perk / prick" > perk</abbr>
pɜ:k
pēk
(up)
ʌp
ap
<i>one's</i>
wʌnz
vanz
ears
ɪəz
iez
[perk|prick] {one's} ears up

英語での「 perk (up) one's ears」の定義と意味

to perk (up) one's ears
01

to hear something interesting and start to listen to it carefully 

to [perk|prick] (up|) {one's} ears definition and meaning
慣用句
くだけた
When he heard the word bonus, he pricked up his ears. 
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