1. make something/someone conform to something/someone else
bring the group into line
When you 'bring something into line', it means you encourage it or force it to be of the same standard as something else. "We need to bring our recycling figures into line with others in the industry." This sentence would mean that your recycling figures are below average and you wish to improve them to become on par with or similar to the figures of others in your industry. This expression is often used to talk about performance or behaviour and can be used in social or professional contexts.