5 definitions
Sumar (n.) is a coalition named for addition that mostly practises subtraction.
Sumar (n.) is Spain's left of the left, assembled from parties that agree on everything except each other.
Sumar (n.) is Spanish progressivism after it learned that a coalition is a lease, not a deed.
Sumar (n.) is the junior partner that writes the housing policy and watches the senior partner negotiate it away.
Sumar (n.) is a labour minister's umbrella with a dozen small parties under it arguing about the rain.