This is the 5032nd most frequent French word.
tonne
A metric ton (1,000 kilograms).
In this sentence, 'tonne' is used figuratively to mean a large quantity or amount, not literally a metric ton.
J'ai acheté une tonne de pommes au marché.
I bought a ton of apples at the market.
Here, 'tonne' is used to denote the metric ton, a unit of mass equal to 1000 kilograms.
Une tonne de sable est nécessaire pour terminer la construction.
One ton of sand is needed to finish the construction.
In this context, 'tonne' is used metaphorically to describe a significant amount of trouble or issues.