each time; whenever it happens; on every occasion
Used to express that something is done or occurs every time a particular situation arises. Often implies a repeated, case-by-case response.
Please report to your boss each time it happens.
When a problem occurs, we'll deal with it each time.
Combination of その (that) and 都度 (each time, occasion). 都度 is a Sino-Japanese compound meaning 'every time' or 'whenever'.