diff --git a/app/javascript/flavours/glitch/components/status_content.jsx b/app/javascript/flavours/glitch/components/status_content.jsx
index 9f7b9cf439..6e6968f868 100644
--- a/app/javascript/flavours/glitch/components/status_content.jsx
+++ b/app/javascript/flavours/glitch/components/status_content.jsx
@@ -108,11 +108,12 @@ class StatusContent extends PureComponent {
     const { status, onCollapsedToggle } = this.props;
     if (status.get('collapsed', null) === null && onCollapsedToggle) {
       const { collapsible, onClick } = this.props;
+      const text = node.querySelector(':scope > .status__content__text');
 
       const collapsed =
           collapsible
           && onClick
-          && node.clientHeight > MAX_HEIGHT
+          && (node.clientHeight > MAX_HEIGHT || (text !== null && text.scrollWidth > text.clientWidth))
           && status.get('spoiler_text').length === 0;
 
       onCollapsedToggle(collapsed);
diff --git a/app/javascript/flavours/glitch/styles/mastodon/_variables.scss b/app/javascript/flavours/glitch/styles/mastodon/_variables.scss
index d561f71454..7a947891d5 100644
--- a/app/javascript/flavours/glitch/styles/mastodon/_variables.scss
+++ b/app/javascript/flavours/glitch/styles/mastodon/_variables.scss
@@ -6,6 +6,9 @@ $backdrop-blur-filter: blur(10px) saturate(180%) contrast(75%) brightness(70%);
 // Language codes that uses CJK fonts
 $cjk-langs: ja, ko, zh-CN, zh-HK, zh-TW;
 
+// Language codes that is written vertically
+$vertical-lr-langs: mn-Mong;
+
 // Variables for components
 $media-modal-media-max-width: 100%;
 
diff --git a/app/javascript/flavours/glitch/styles/mastodon/components.scss b/app/javascript/flavours/glitch/styles/mastodon/components.scss
index ac501195b7..d3095fe372 100644
--- a/app/javascript/flavours/glitch/styles/mastodon/components.scss
+++ b/app/javascript/flavours/glitch/styles/mastodon/components.scss
@@ -1402,6 +1402,38 @@ body > [data-popper-placement] {
   }
 }
 
+@each $lang in $vertical-lr-langs {
+  // writing-mode and width must be applied to a single element. When
+  // this element inherits a text direction that is opposite to its own,
+  // the start of this element's text is cut off.
+
+  .status:not(.status--is-quote)
+    > .status__content
+    > .status__content__text:lang(#{$lang}),
+  .conversation
+    > .conversation__content
+    > .status__content
+    > .status__content__text:lang(#{$lang}) {
+    writing-mode: vertical-lr;
+    width: 100%; // detecting overflow
+    max-width: calc(100% - mod(100%, 22px)); // avoid cut-offs
+    max-height: 209px; // roughly above 500 characters, readable
+    overflow-x: hidden; // read more
+  }
+
+  .autosuggest-textarea > .autosuggest-textarea__textarea:lang(#{$lang}) {
+    writing-mode: vertical-lr;
+    min-height: 209px; // writable
+  }
+
+  .detailed-status > .status__content > .status__content__text:lang(#{$lang}) {
+    writing-mode: vertical-lr;
+    width: 100%; // detecting overflow
+    max-height: 50vh;
+    overflow-x: auto;
+  }
+}
+
 .status__content.status__content--collapsed {
   max-height: 20px * 15; // 15 lines is roughly above 500 characters
 }