Explanation:

- The idiom "win laurels" refers to achieving recognition or receiving honors for accomplishments. This is because laurels, historically, were used to crown victors in athletic or poetic competitions in ancient times, signifying honor and victory.

- Option 1: To gain honour: This option aligns perfectly with the idiom's meaning, as it reflects the idea of earning respect or fame due to achievements.

- Option 2: To be decisive: This pertains to making firm decisions and does not connect with gaining recognition or honor.

- Option 3: To change: This involves altering or transforming, which is unrelated to achieving acclaim or success.

- Option 4: To punish: This is about inflicting a penalty for wrongdoing and does not share meaning with the idiom.