This is the 11250th most frequent Catalan word.
tocarien
"They would touch" or "they would play" (depending on context).
The verb 'tocarien' here is in the conditional tense and is used to indicate a hypothetical action of the subject 'ells' (they) ringing the bells.
Ells tocarien les campanes si no fos tan tard.
They would ring the bells if it weren't so late.
The verb 'tocarien' in this conditional clause expresses a reactionary action, conditional upon another subject's action.
Si ens tocassÃeu, ens tocarien de tornada.
If you were to touch us, they would touch us back.
In this case, 'tocarien' denotes the hypothetical action of contact between the books and the table under specific conditions.