Replace it. The bad one will probably feel loose when switched, just take one wire off at a time and put it on the new one.
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To fix a three-way switch, first check if the issue is with the switch itself or the wiring. If it's the switch, you can replace it with a new one following the wiring diagram for three-way switches. If the issue is with the wiring, you may need to trace and repair any faulty connections or replace damaged wires.
A two way switch is UK terminology for a North American three way switch. Though the switch has two names it is still a Single Pole Double Throw switch that has three terminals. North American terminology. The circuit is the same as the three way switch system. To control from four locations just add another intermediate switch. For the system to work properly the new intermediate switch has to be adjacent to the existing intermediate switch. The connections must run - three way, intermediate, intermediate, three way.
A three-way lamp switch requires a dedicated three-way bulb and socket to function on all three settings. If used in an outlet controlled by a wall switch, the voltage may not be appropriate for all settings to operate correctly. Additionally, the wiring configuration in the wall switch setup may not be compatible with the three-way lamp switch.
A three-way switch can be compared to a fork in the road, where you have two choices on which way to go. It can also be compared to a team with three players passing a ball back and forth, each player having a turn to control the direction of the ball.
The switch operates from two locations, such as upstairs and downstairs, but there are three ways it can be set: both switches "on", both switches "off", or one switch "on" and one switch "off".
A three way switch is one of two devices that is used in operating a load from two different positions. This type of electrical circuit is known as three way switching. This terminology is used in North America, in Europe and the UK this type of switching is known as two way switching.