1. assure, ensure, guarantee, insure, secure

make certain of

Example Sentences:
'This nest egg will ensure a nice retirement for us'
'Preparation will guarantee success!'

• ensure
• guarantee
• insure
• secure

2. assure, tell

inform positively and with certainty and confidence

Example Sentences:
'I tell you that man is a crook!'

• tell

3. assure

assure somebody of the truth of something with the intention of giving the listener confidence

Example Sentences:
'I assured him that traveling to Cambodia was safe'

4. ascertain, assure, check, control, ensure, insure, see, see to it

be careful or certain to do something; make certain of something

Example Sentences:
'He verified that the valves were closed'
'See that the curtains are closed'
'control the quality of the product'

• ascertain
• check
• control
• ensure
• insure
• see
• see to it

5. assure, reassure

cause to feel sure; give reassurance to

Example Sentences:
'The airline tried to reassure the customers that the planes were safe'

• reassure

6. assure, promise

make a promise or commitment

• promise