check
let
set
work
100

make sure that there is nothing wrong with somebody or something

check on

100

fail to do something or help somebody as he/she had hoped

let down

100
1. begin a journey

2. cause somebody to start doing something, especially laughing or talking

3. cause a series of things to happen/occur

set off

100

1. find the answer to something

2. plan something in detail

3. have a good or specified result

4. engage in vigorous physical exercise

work out
200
arrive and register at a hotel, airport, etc.

check in

200
(of something undesirable) become less intense

let up

200

1. aim or intend to do something

2. arrange or display something in a particular order or position

set out

200

try hard to improve or achieve something

work on

300

tick or otherwise mark an item on a list to show that it has been dealt with

check off

300
1. punish somebody lightly or not at all for doing something wrong

2. excuse somebody from a task or obligation

let off

300

delay or block the progress of somebody or something

set back

300
1. make somebody or yourself reach a state of great excitement, anger, etc.

2. develop or produce by activity or effort

work up

400

1. prove to be true or correct

2. confirm the truth or inform yourself about somebody or something

3. look at or take notice of

check out

400

reveal information

let on

400

give somebody an air of unusual superiority / make somebody seem better than the rest in an unusual way

set apart
400
1. get rid of something, especially a strong feeling, by using physical effort

2. earn money in order to be able to pay a debt

work off

500

(three words)

investigate in order to establish the truth about or accuracy of something

check up on

500

(three words)

allow somebody to know or share something secret

let in on

500

1. make an innocent person appear guilty of something

2. establish a business, institution, organisation, etc.

set up

500

(three words)

proceed gradually towards something more advanced or intense

work up to