1 to switch over

2 to switch modes or data streams

3 to cut (to a new scene)

1 to exchange

2 to change (clothes etc)

3 to substitute

4 to switch

5 to convert (currency)

1 to take up one's post

2 to be given a job

1 to come off sentry duty

2 to lay off (a worker)

3 laid-off

1 to exchange

1 to engage in fraudulent activities (idiom)

2 skulduggery

3 to hoodwink people

4 to cheat sb audaciously

1 lit. to steal a rafter and replace it with a column

2 to replace the original with a fake

3 to perpetrate a fraud (idiom)

1 different broth but the same old medicine (idiom); a change in name only

2 a change in form but not in substance

1 to adjust one's head and turn one's face (idiom); cosmetic changes

2 Despite superficially new policies, the substance remains unchanged.

1 both covert and undercover (officers) keeping watch (idiom)