1 tell-tale

2 informer (esp. to police)

3 whistleblower

4 grass

1 secret code

2 ciphertext

3 password

4 PIN

1 root

2 basis

3 classifier for long slender objects, e.g. cigarettes, guitar strings

4 classifier: 条 tiáo

5 radical (chemistry)

1 according to

2 based on

3 basis

4 foundation

5 classifier: 个 gè

1 fundamental

2 basic

3 root

4 simply

5 absolutely (not)

6 (not) at all

7 classifier: 个 gè

1 to dig up roots and inquire at the base (idiom); to get to the bottom of sth

1 lit. cut grass and pull out roots (idiom); fig. to destroy root and branch

2 to eradicate

1 inextricably linked (idiom)

2 inseparable

1 lit. to examine roots and inquire at the base (idiom); to get to the bottom of sth

1 to cut weeds and eliminate the roots (idiom); to destroy root and branch

2 to eliminate completely