Correct

塌心

/ tā xīn / 
Strokes

Example

As a Verb

have peace of mind; settle down; set one's mind at ease/rest

1
Wèntí
问题
yī
一
jiějué
解决
  
,
jiù
就
tāxīn
塌心
le
了
  
。

I was relieved as soon as the matter was settled.

2
Tā
他
jīntiān
今天
tā
塌
bù
不
xià
下
xīn
心
lái
来
zuò
做
rènhé
任何
shì
事
  
。

He can't settle down to anything today.

3
Rènwu
任务
bù
不
wánchéng
完成
  
,
wǒ
我
bù
不
tāxīn
塌心
  
。

I cannot set my mind at ease until the task is accomplished.

4
Tāxīn
塌心
gōngzuò
工作
  
/
xuéxí
学习

settle down to work/studies