Connotations is the usual answer, but there are a variety of synonyms for a connotation. I'm sure that it is a connotation.
Here, the verb catch is a transitive verb, but the object/agent is missing. The action of catching a thief devolves onto the police or the people. So, we need to create the agent as per the context. The thief has been caught by the people/ police/them.
Consequently, the active form of the sentence will be:
The police has caught the thief.
The people have caught the thief.
They have caught the thief.
Answer:
During an asthma attack, also called an asthma exacerbation, the airways become swollen and inflamed. The muscles around the airways contract and the airways produce extra mucus, causing the breathing (bronchial) tubes to narrow. During an attack, you may cough, wheeze and have trouble breathing.