The UK economy shrank by 0.3% in April, the latest data from the Office for National Statistics shows.
Services shrank by 0.4%, along with production at 0.6%, but construction moved in the opposite direction, growing by 0.9%.
Economists expected a 0.1% contraction in April, following growth of 0.2% in March.
The slowdown has been blamed on the financial uncertainty caused by steep tariffs imposed by Donald Trump.
What is GDP and why do we care about it?
GDP is a tool used to assess the size and health of an economy.
It stands for gross domestic product and measures the monetary value of final goods and services produced in the country over a given period.
Generally, if GDP is growing and inflation is in check, it's a strong sign that the economy is doing well, with more jobs and better wages available, and people spending more money.
If it's falling, it signals the economy is doing badly, often bringing with it lower incomes and job cuts.
Governments, businesses and economists monitor GDP growth among other indicators to understand where the economy stands - and where it's headed.